CPython - Read Python Dictionary (keys/values) inside a C Function Passed as argument

You should go through the link, https://docs.python.org/2/c-api/dict.html Excerpt given below,

PyObject* PyDict_GetItem(PyObject *p, PyObject *key)
Return value: Borrowed reference.
Return the object from dictionary p which has a key key. Return NULL if the key key is not present, but without setting an exception.

PyObject* PyDict_GetItemString(PyObject *p, const char *key)
Return value: Borrowed reference.
This is the same as PyDict_GetItem(), but key is specified as a char*, rather than a PyObject*.

PyObject* PyDict_Items(PyObject *p)
Return value: New reference.
Return a PyListObject containing all the items from the dictionary, as in the dictionary method dict.items().

PyObject* PyDict_Keys(PyObject *p)
Return value: New reference.
Return a PyListObject containing all the keys from the dictionary, as in the dictionary method dict.keys().

PyObject* PyDict_Values(PyObject *p)
Return value: New reference.
Return a PyListObject containing all the values from the dictionary p, as in the dictionary method dict.values().

Keep an eye on borrowed reference / new reference. It is little tricky while coding for Python extensions.